Collapsible mold core



C. HUTCHINS. COLLAPSIBLE MOLD COR E.

APPLICATION FILED APR.30,19ZI.

Patented Oct. 3, 1922.

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COLIN I-IU'TGHINS, OF LEAMING-TQN, ONTARIO, CANADA.

COLLAPSIBLE MOLD CORE.

Application filed April 30.

To all whom it may concern Be it known that 1. tons Hu'ronins, a subject of the King of Great Britain, residing at Leamington, in the county of Essex, Province of Untario, Dominion of Canada, have invented certain new and useful Improvements in Collapsible Mold Cores, of which the following is a specifi- "ation, reference being had therein. to the accompanying drawings.

This invention relates to mold cores, and has special reference to a collapsible core that may be used in a mold for producing hollow building blocks made of concrete or other plastic material.

My invention aims to provide a mold core with walls that can be easily and quickly shifted to permit of the core being easily and quickly removed from a molded block. The core walls are arranged to be distended or retracted by mechanism within the core, and the mechanism is arranged within the core so that it may be easily operated and will constitute means for carrying the core or manipulating relative to a mold.

My invention further aims to provide a strong durable and inexpensive metallic mold core and the construction entering into my invention will be hereinafter described and then claimed.

Reference will now be had to the drawing, wherein- Figure 1 is a plan of the mold core;

Fig. 2 is a longitudinal sectional view of the same, partly broken away;

Fig. 3 is a perspective View of a portion of the mold core, and

Fig. 1 is a vertical sectional view of a portion. of the core that is of a different shape from that illustrated in 1, and provided with different operating handles.

The mold core comprises angle plates 1, 2, 3 and -1- and these plates are assembled so that the edges thereof will overlap, as at 5, and all of said angle plates cooperate in forming a core that has end and side walls providing a structure which rectangular in cross section.

The angle plates have the inner faces thereof provided with angle bars 6 and 7 extending from the lower edges of the angle plates to the upper edges thereof and with the angle bars 6 in the angles of said plates and the angle bars 7 intermediate the lapped edge of each angle plate and the angle bars 6. The angle bars 6 and 7 of 1921. Serial No. 465,656.

the plates 1 and 3 are .in opposed relation to the angle bars 6 and 7 of the plates 2 and 1-, and the opposed angle bars 6 and 7 are each connected to toggle members 8 and said toggle members are pivotally connected, as at 9, to an inverted U-shaped lever or yoke 10 having a handle piece 11. Each yoke extends downwardly in the collapsible core with all of the toggle members 8 connected thereto so that the yoke may be elevated to retract the angle plates 1 and E2, or distend said angle plates when the yoke is forced downwardly in the core. It is preferable to have the yoke 10 set in the core so that a covermay be placed over the top of the core to prevent concrete orother material from entering the core. The yokes 10 are in the central longitudinal plane of the core, and consequently both of said yokes may be gripped to retract or distend the angle plates 1 and 3 relative to the plates 2 and 4t- .The angle bars 7 of the angle plates 1 and 8 and the angle plates 2 and 4 are connected by sets of tog 'le members 12 and said toggle members are pivotally connected, as at 13 to vertically disposed connecting bars 14; adjacent the overlapped edges of the angle plates. These connecting bars permit of the toggle members at each side of the collapsible core being adjusted in svnchronism, and levers 15 are employed for raising and lowering the bars 1 1. The levers 15 are loosely connected to the bars 14, as at 16 and said levers have the inner ends thereof pivotally connected. as at 17, to the angle bars 7 of the angles plates 1 and 2. The opposite ends of the levers 15 extend parallel to the angle plates 3 and i and in proximity to the end of the collapsible core. By placing the hands in the hollow core and gripping the outer ends of the levers 15, said levers may be simultaneously raised or lowered. to shift the bars 1 1 and the toggle members 12 and thus retract or distend the end walls of the core.

The ends of the toggle members 8 and 12. which are connected to the angle bars 6 and 7. have facets 18 disposed at a right angle to the longitudinal. edges of the toggle members and adapted to engage the angle bars and cooperate therewith in preventing a breakdown movement of the toggle members, and in order that the toggle members may be broken upwardly by the yokes 10 and the levers 15, the pivoted ends of said toggle members have angularly disposed facets 19 providing clearance for the turning movement of the pivoted ends of the toggle members. Furthermore, at the plVOlJZtl connections between the toggle members, the bars 14 and the levers 15, there may be pin and slot connections, as shown, so that there will be no binding action which would prohibit the adjustment of the toggle members as defined.

Reference will now be had to Fig. 4 of the drawing, showing a portion of a small collapsible core which is square in cross section compared to the oblong shape of the core shown in Figs. 1 and 2. VVith this type of core the side and end walls of the angle plates 20 are of equal length with angle bars 21 in the corners thereof. The angle bars 21 are connected by toggle members 22 to vertically disposed bars 23 having the upper ends thereof terminating in handles 24, and said handles may be within the core or above the upper end thereof, as shown, so that all of said handles may be gripped and the toggle members 22 broken upwardly to retract the angle plate 20 and thus reduce the cross sectional area of the collapsible core.

The cores as now used are made of strong and durable sheet metal and by reason of the shiftable walls the cores may be easily and quickly removed from a concrete block which has been formed between the collapsible core and mold walls (not shown).

While in the drawing there are illustrated the preferred embodiments of my invention, it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claims. 1

What I claim is 1. A collapsible core comprising angle plates having overlapped edges and providing end and side walls for the core, angle bars carried by said angle plates, sets of toggle members connecting said angle bars adapted to retract and distend the side walls of the core, and sets of toggle members connecting some of said angle bars adapted to retract and distend the end walls of the core.

2. A collapsible core as in claim 1., and yokes connected to the first mentioned toggle members for shifting said toggle members.

3. A collapsible core as iii-claim 1, and levers connected to some of said angle bars and to the last mentioned toggle members and adapted to shift said toggle members.

4. A collapsible core comprising angle plates providing side and end core walls, sets of transverse toggle members connecting the core side walls and adapted to shift said walls, sets of longitudinal toggle members adapted to shift the core end walls, and means to facilitate shifting all of said members.

5. A collapsible core as in claim 4, wherein said means includes yokesin the ends of the core, and levers at the sides of said core.

In testimony whereof I affix my signature in presence of two witnesses.

COLIN HUTCHINS. lVitnesses ANNA M. Donn, KARL H. BUTLER. 

